Quadratic functional equation - Open Access .click

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Set valued pexiderized quadratic functional equation

Aequationes mathematicae
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Mohammadi, Elham, Najati, Abbas, Nikodem, Kazimierz +2 more
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On Set-Valued Solutions of a Generalized Bi-quadratic Functional Equation

, 2020
Iz-iddine El-Fassi, El-sayed El-hady, K. Nikodem +2 more
semanticscholar +1 more source

Stability of the Quadratic Functional Equation

1998
The quadratic functional equation $$ f\left( {x + y} \right) + f\left( {x - y} \right) - 2f\left( x \right) - 2f\left( y \right) = 0$$ (3.1) clearly has f(x) = cx2 as a solution with c an arbitrary constant when f is a real function of a real variable.
Donald H. Hyers, George Isac, Themistocles M. Rassias +2 more
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Additive-Quadratic Functional Equations

2023
Hemen Dutta +3 more
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Approximate solutions of a quadratic functional equation in 2-Banach spaces using fixed point theorem

Journal of Fixed Point Theory and Applications, 2019
K. Y. N. Sayar, A. Bergam
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Set-Valued Solutions of a Generalized Quadratic Functional Equation

Results in Mathematics, 2018
A. Baias, Bianca Moșneguțu, D. Popa
semanticscholar +1 more source

On a new type of stability of a radical quadratic functional equation using Brzdȩk’s fixed point theorem

, 2017
L. Aiemsomboon, W. Sintunavarat
semanticscholar +1 more source

Stability of a mixed additive and quadratic functional equation in quasi-Banach spaces

, 2018
N. Dung, VO Thi LE Hang
semanticscholar +1 more source

Non-Archimedean stability of a generalized reciprocal-quadratic functional equation in several variables by direct and fixed point methods

, 2018
B. V. S. Kumar, H. Dutta
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